Download MCAT Fluid dynamics

IMPORTANT KEY POINTS OF MCAT PHYSICS
UNIIT:- FLUID DYNAMICS
1:-Fluid may be gases or liquids.
2:-Work done by drag force is negative.
3:-Viscosity of liquids decreases with rise of temperature .
4:-Viscosity of gases increases with rise of temperature.
5:-Mechanics is concerned with motion of the bodies under the action of forces.
6:-When a body is moving with terminal velocity then it has zero acceleration.
7:-At terminal velocity fluid friction is maximum.
8:-At terminal velocity the net force acting on the body is zero.
9:-Terminal velocity of the body is directly proportional to its mass & density.
10:-Strokes law holds good for objects having spherical symmetry.
11:-Ideal fluid is also ir-rotational so it has zero angular momentum.
12:- Above critical velocity flow is turbulent.
13:-Venturi’s meter is used to check the type of fluid flow & measure the speed of fluid.
14:-Systolic pressure is the maximum value of normal blood pressure.
15:-With the passage of time flexibility of blood vessels decreases.
16:-Flow rate remains same at every point & every where.
17:-Coefficient of viscosity does not depends upon pressure & density of fluid & does
depends upon nature & temperature of fluid.
18:-Product of pressure & time is viscosity & its unit is poise & pascal second.
19:-Viscosity of liquids is due to type of frictional forces which are cohesive forces.
20:-For aged person value of systolic & diastolic pressure in increased.
21:-By increasing the pressure of fluid density of fluid also increases. As
P=
𝟏
𝟑
28:- Bernoulli’s equation is a special case of Euler’s equation.
29:- Viscous flow of a fluig is also called poiseuille flow.
30:- Founder of modern fluid dynamics are Ludwig Prandtl & G.I Taylor.
31:- Fluid mechanics is the branch of science which is concerned with moving & stationary fluids.
32:- Ratio of dynamic viscosity to density is called kinematic viscosity. & its unit is m 2sec-1.
33:- Ball pen functions on the principle of surface tension.
34:-The magnitude of tensile force that acts per unit length is called surface tension.
35:-Fluid motion leading to circular or nearly circular streamlines is called vortex motion.
36:-Kinematic viscosity sometimes also called momentum diffusivity.
37:- The radius of aorta is  10mm & blood flowing through it has a speed of  300 mm/sec.
38:- A Capillary has a radius of  4×10-3 mm & speed of blood flowing through it is 5×10-4 m/sec.
39:- Diastolic pressure is the minimum value of normal blood pressure.
40:- Graph b/w surface tension & temperature is given below.
Surface tension
Temperature
41:- At systolic pressure flow of fluid is turbulent & flow is laminar at diastolic pressure
42:- Graph (1) b/w velocity & time when object is thrown upward with velocity V,
(2) B/w height (h) to which liquid rise in tube & radius of capillary tube .
 V2
22:-Speed of fluid is maximum in venturimeter at converging duct.
23:-Fluid dynamics is further divided into two categories ,
V
i.e. Aerodynamics & Hydrodynamics
24:-The study of fluid at rest is called hydrostatics.
25:-A fluid motion in term of position of entire particle is called Lagrangian Specification.
o
26:-The path followed by a fluid element is called particle path or flow line.
27:-According to Archimedes Principle , whatever the shape of body ,the net force is an
upthrust & is equal to g times the mass of fluid displaced by the body which is weight of body.
(h) Height
where, h is given by formula
𝟐𝑻𝒄𝒐𝒔
=> h =
where,T is tension.
𝒓𝒈
Time
Radius of tube
Graph (1)
Graph (2)
BY:- YASIR MUKHTAR ………………………………………………...<STUDENT OF MCAT>……………………………………………………………………… Page 1